Mutants of Escherichia coli K12 lacking thymine.
D000630:Aminopterin / Q000494:pharmacology; D002874:Chromosome Mapping; D003090:Coliphages; D004269:DNA, Bacterial / Q000096:biosynthesis*; D004926:Escherichia coli / Q000378:metabolism*; D066298:In Vitro Techniques; D009154:Mutation; D013941:Thymine / Q000378:metabolism*
D004269:DNA, Bacterial; D000630:Aminopterin; D013941:Thymine